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https://issues.apache.org/jira/browse/SOLR-15031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17294985#comment-17294985
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David Smiley commented on SOLR-15031:
-------------------------------------
Yeah; it'd be an upgrade headache to change the contract or create some other
parseNotNull. Ugh.
Alternatively -- I've been thinking Lucene/Solr would benefit from having a
"Nullable" annotation in our codebase with IDE support and/or static analysis
checkers. It'd need a bit of exploration and a dev list post to draw attention
to it.
> NPE caused by FunctionQParser returning a null ValueSource
> ----------------------------------------------------------
>
> Key: SOLR-15031
> URL: https://issues.apache.org/jira/browse/SOLR-15031
> Project: Solr
> Issue Type: Bug
> Reporter: Pieter
> Assignee: Mike Drob
> Priority: Minor
> Fix For: 8.8, master (9.0)
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> When parsing a sub query in a function query,
> {{FunctionQParser#parseValueSource}} does not check if the produced query
> object is null. When it is, it just wraps a null in a {{QueryValueSource}}
> object. This is a cause for NPE's in code consuming that object. Parsed
> queries can be null, for example when the query string only contains
> stopwords, so we need handle that condition.
> h3. Steps to reproduce the issue
> # Start solr with the techproducts example collection: {{solr start -e
> techproducts}}
> # Add a stopword to
> SOLR_DIR/example/techproducts/solr/techproducts/conf/stopwords.txt, for
> example "at"
> # Reload the core
> # Execute a function query:
> {code:java}
> http://localhost:8983/solr/techproducts/select?fieldquery={!field%20f=features%20v=%27%22at%22%27}&q={!func}%20if($fieldquery,1,0){code}
> The following stacktrace is produced:
> {code:java}
> 2020-12-03 13:35:38.868 INFO (qtp2095677157-21) [ x:techproducts]
> o.a.s.c.S.Request [techproducts] webapp=/solr path=/select
> params={q={!func}+if($fieldquery,1,0)&fieldquery={!field+f%3Dfeatures+v%3D'"at"'}}
> status=500 QTime=34
> 2020-12-03 13:35:38.872 ERROR (qtp2095677157-21) [ x:techproducts]
> o.a.s.s.HttpSolrCall null:java.lang.NullPointerException
> at
> org.apache.lucene.queries.function.valuesource.QueryValueSource.hashCode(QueryValueSource.java:63)
> at
> org.apache.lucene.queries.function.valuesource.IfFunction.hashCode(IfFunction.java:129)
> at
> org.apache.lucene.queries.function.FunctionQuery.hashCode(FunctionQuery.java:176)
> at
> org.apache.solr.search.QueryResultKey.<init>(QueryResultKey.java:53)
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1341)
> at
> org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:580)
> {code}
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